Often times multiple roosters are when romance meets reality, as AArt says. Roosters are a crap shoot, and there are no guarantees that this set up will work with these roosters.
Flock-mate roosters raised without older roosters often become very aggressive and bullies to both pullets and people. If you build a second coop/run, I think I would put both roosters in one, and the pullets in the other until everyone is over 9-12 months old. Cockerels are very hard on pullets without older birds to educate them.
I think that roosters take a lot of experience, and a sharp knife. Not a lot of roosters really work in a smaller set up. Some will, until they don't, when they don't you need a plan B set up and ready to go to separate them.
Often times the noise is unbelievable as they challenge each other by crowing. Do you have neighbors? Sometimes they will fight through a fence, so if you let one group out to "free range" they fight through the fence even though in separate coops/runs.
If you have more of a farm set up than a backyard set up, you might pull this off, but maybe not.... wishing they would all get along, won't work. You need a plan B, and a plan C which might mean culling a rooster from your flock. (Or rehoming him to someone else, often times harder than one thinks, so if you get a chance, take it).
If this is your first year with chickens, if you have children under the age of 6 I strongly recommend no roosters. Roosters can go from the darling to the nightmare in an instant. And people often underestimate the violence of a rooster attack. The above poster that does this must have a huge amount of chickens and an even bigger space for those chickens, and multi-generations of birds which totally changes the situation.
I see you are trying to be proactive so that you do not have to remove a rooster, it might work, it might not.... it probably won't work as you envision it now.
Mrs K
